﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

namespace Abot.Demo.CNBlogs
{
    public class RegexLib
    {
        //身份证号码正则表达式
        public static bool IsIDNumber(string id)
        {
            bool b5 = Regex.IsMatch(id, @"^(\d{15}|\d{18})$");
            return b5;
        }

        //匹配电话号码
        public static bool IsPhone(string phone)
        {
            return Regex.IsMatch(phone, @"^((\d{3,4}\-\d?{7,8})|(\d{5}))$");
        }
        //匹配email的regex
        public static bool IsEmail(string email)
        {
            return Regex.IsMatch(email, @"^\w+@\w+\.\w+$");
        }

        //匹配ip地址的regex
        public static bool IsIP(string ip)
        {
            return Regex.IsMatch(ip, @"^\d{1,3}(\.\d{1,3}){3}$");
        }

        //匹配日期合法regex
        public static bool IsDate(string date)
        {
            return Regex.IsMatch(date, @"^\d{4}\-\d{1,2}\-\d{1,2}$");
        }

        //匹配url地址的regex
        //"http://hovertree.com"
        //"http://keleyi.com/a/bjae/h1o76nuh.htm?id=3&name=aaa"
        //"https://s.taobao.com/search?q=hover+tree&js=1&stats_click=search_radio_all%3A1&initiative_id=staobaoz_20151204&ie=utf8"
        //"ftp://127.0.0.1/myslider.txt"
        public static bool IsURL(string url)
        {
            return Regex.IsMatch(url, @"^[a-zA-Z]+://.+$");
        }

        /**/
        /// <summary>
        /// 判断用户输入是否为日期
        /// </summary>
        /// <param name="strValue"></param>
        /// <returns></returns>
        /// <remarks>
        /// 可判断格式如下（其中-可替换为/，不影响验证)
        /// YYYY | YYYY-MM | YYYY-MM-DD | YYYY-MM-DD HH:MM:SS | YYYY-MM-DD HH:MM:SS.FFF
        /// </remarks>
        public static bool IsDateTime(string strValue)
        {
            if (null == strValue)
            {
                return false;
            }

            string regexDate = @"[1-2]{1}[0-9]{3}((-|\/){1}(([0]?[1-9]{1})|(1[0-2]{1}))((-|\/){1}((([0]?[1-9]{1})|([1-2]{1}[0-9]{1})|(3[0-1]{1})))( (([0-1]{1}[0-9]{1})|2[0-3]{1}):([0-5]{1}[0-9]{1}):([0-5]{1}[0-9]{1})(\.[0-9]{3})?)?)?)?$";

            if (Regex.IsMatch(strValue, regexDate))
            {
                //以下各月份日期验证，保证验证的完整性
                int _IndexY = -1;
                int _IndexM = -1;
                int _IndexD = -1;

                if (-1 != (_IndexY = strValue.IndexOf("-")))
                {
                    _IndexM = strValue.IndexOf("-", _IndexY + 1);
                    _IndexD = strValue.IndexOf(":");
                }
                else
                {
                    _IndexY = strValue.IndexOf("/");
                    _IndexM = strValue.IndexOf("/", _IndexY + 1);
                    _IndexD = strValue.IndexOf(":");
                }

                //不包含日期部分，直接返回true
                if (-1 == _IndexM)
                    return true;

                if (-1 == _IndexD)
                {
                    _IndexD = strValue.Length + 3;
                }

                int iYear = Convert.ToInt32(strValue.Substring(0, _IndexY));
                int iMonth = Convert.ToInt32(strValue.Substring(_IndexY + 1, _IndexM - _IndexY - 1));
                int iDate = Convert.ToInt32(strValue.Substring(_IndexM + 1, _IndexD - _IndexM - 4));

                //判断月份日期
                if ((iMonth < 8 && 1 == iMonth % 2) || (iMonth > 8 && 0 == iMonth % 2))
                {
                    if (iDate < 32)
                        return true;
                }
                else
                {
                    if (iMonth != 2)
                    {
                        if (iDate < 31)
                            return true;
                    }
                    else
                    {
                        //闰年
                        if ((0 == iYear % 400) || (0 == iYear % 4 && 0 < iYear % 100))
                        {
                            if (iDate < 30)
                                return true;
                        }
                        else
                        {
                            if (iDate < 29)
                                return true;
                        }
                    }
                }
            }

            return false;
        }
    }
}
